In the Context of the Chain of Command in an Organization

In the context of the chain of command in an organization, which of the following is a difference between line authority and staff authority?

A) Line authority is the right to advise but not command immediate subordinates, whereas staff authority is the right to command immediate subordinates.
B) Line authority is the right to advise people who are not subordinates, whereas staff authority is the right to command people who are not subordinates.
C) Line authority is the right to command immediate subordinates, whereas staff authority is the right to advise but not command people who are not subordinates.
D) Line authority is the right of top managers to advise first-line managers, whereas staff authority is the right of first-line managers to command middle managers.